$\int \frac{2 t+1}{t^2+t+1} d t=$

  • A
    $\log \left|t^2+t+1\right|+c$
  • B
    $\log \left|t^2-t+1\right|+c$
  • C
    $\log \left|t^2-2 t-1\right|+c$
  • D
    $\log \left|t^2-3 t+1\right|+c$

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$\int \frac{\sin 2x \, dx}{1 + \cos^2 x} = $

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